public class Demo13 {
    private static int count=0; //将count定义为成员变量
    public static Object locker=new Object();
    public static void main(String[] args) throws InterruptedException {
        Thread t1=new Thread(()->{
            synchronized (locker){
                for (int i = 0; i < 10000; i++) {
                    count++;
                }
            }
        });

        Thread t2=new Thread(()->{
              synchronized (locker){
                  for (int i = 0; i < 10000; i++) {
                      count++;
                  }
              }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(count);
    }
}
